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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d958700334935da0314c0937599e2cdef72e19eb85368d80e38f4186c1e9943' 
  AND token = 'uWL2AJtDAaoRcpF1bRV7ayp5lzEQmiIV+HEUTqsgmxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}